Injector



' 1., J. C. AND R. D! METCALFE.

INJECTOR.

APPLICATION FILED JULY 8. 1919.

1,329,465 Patented Feb. 3,1920.

Inventors JMebcaZI'e JCJIIetcaLfe "*v RJlZI Ietcalfe U ITED STATESPATENT OFFICE.

JAMES METCALFE AND JAMES CROXON METCALFE, 0F MARZPLE, 'AND RICHARD DAVIDMIiI'IGALIEIEl, OF ROMILEY, ENGLAND.

INJECTOR.

Specification of Letters Patent.

Patented Feb. 3, 1920.

Application filed July 8, 1919. Serial No. 309,310.

To all whom it may concern:

Be it known that we, JAMES METCALFE and JAMES CRoXoN METOALFE, both ofSheen Bank, Marple, in the county of Chester, England, and RICHARD DAVIDMETGALFE, of the Mount, Romiley, in the county of Chester, England,subjects of the King of Great Britain and Ireland, have invented certalnnew and useful Improvements in Injectors, of which the following is aspecification.

This invention relates to steam injectors and has for its object toprovide improved means for controlling the overflow from the injectorwhen the latter is starting. 7 Y With injectors dealing with hot feedwater and high pressure steam, difliculty is experienced in obtaining asufficiently free overflow at starting to permit of the quickestablishment of a proper condensed steam jet in the combining nozzlehaving the necessary velocity to deliver into the boiler or vessel beingfed. In our prior Patents Nos. 905206 and 1,194,207, we have proposed todivide the overflow chamber around the combining nozzle into twocompartments each With its own overflow valve, and to load the valveadjacent the delivery end of the combining nozzle by the pressure in thedelivery chamber of the injector. Under certain conditions, we havefound that this construction will not enable the overflow to escapesufficiently freely to permit of the ready establishment of thecondensed steam jet and the normal operation of the injector. Thedifiiculty of starting the injector is further accentuated by steamwhich may leak into the injector past the steam control valve or waterwhich may leak into the injector past the delivery or back pressurevalve, so heating the feed pipe and causing an accumulation of hot watertherein, so that the said water evaporates when the pressure on itssurface is reduced by the action of the steam jet issuing into thecombining nozzle and the water is not readily lifted.

The object of our present invention is to Referring to the accompanyingexplanatory drawings Figure 1 is a sectional elevation of an injectorconstructed in accordance with our invention.

Fig. 2 is a detail cross sectional view the line A B of Fig. l.

The injector comprises a steam inlet nozzle a, known as the liftingnozzle, and acentral steam nozzle 44, known as the forcing nozzle, awater cone Z), a combining nozzle divided into two parts 0, d and adelivery nozzle 6. Steam enters at and water at g, the steam upply tothe injector being controlled by a steam valve having a stem part itwhich enters within the forcing nozzle a, and a part i which controlsthe admission of steam to the nozzle a. The

can be locked in its closed position for feed water heating purposes bythe screwed spindle t as in Patent N 0. 1194207. I

There is a water inlet valve u to the compartment 7a which worksautomatically ac cording to the difference in the pressures at itsopposite sides, but the water supply to the said valve may be cut off bythe hand operated valve 1).

Upon the overflow compartment m we provide a second overflow valve toheld on its seat by gravity or a spring :22 but actuated by a cam 3/upon a spindle z. The lat ter carries a crank arm 3 which, by means of aconnecting rod 4 is detachably attached to a projecting pin 5 on the arm6 pivoted at 7 which actuates the steam valve.

With the arrangement before described, at starting, the lever 6 isoperated to open the valve part 2'. The overflow valve to is then heldoff its seat by the cam y so that overflow can take place not onlythrough the valves 0, p but through the positively opened valve 4/).This greatly facilitates the starting of the injector. A. furthermovement of the lever 6 opens also the valve portion h but it thenallows of the closing of the valve to so that the overflow is thencontrolled entirely automatically by the pressure in the deliverychamber on the valve 1?.

The valve to is always fully open when the steam valves 72., i areclosed so that any leakage past the said valve can escape freely toatmosphere.

If it is desired to preheat the feed water the valves 0 and p are heldclosed by the locking spindle t and the connecting rod A is disconnectedfrom the pin 5. WVhen the steam valve is opened, the steam passes downthe feed pipe and warms the feed water supply.

Having now we claim as new and ters Patent is 1. In injectors, incombination, lifting and forcing steam inlet nozzles, a combiningnozzle, a delivery nozzle, an overflow chamber divided into twocompartments, each having communication with the interior of thecombining nozzle, a delivery chamber, a steam control valve havingportions control ling the steam supply to the lifting and the forcingsteam nozzles, a water inlet, automatic overflow valves upon each ofsaid described our invention what desire to secure by Let- 'overflowcompartments, a lever controlling one overflow valve and loaded by thepressure in said delivery chamber, a positively operated overflow valveon the compartment having the lever loaded valve thereon, and meansforopening said positive overflow valve when both the steam valveportions are shut or the lifting portion only is open, and insuring theclosing of said overflow valve when both the steam valve portions arefully open, as set forth.

2. In injectors, in combination, lifting and forcing steam inletnozzles, a combining nozzle, a delivery nozzle, an overflow chamberdivided into two compartments around the combining nozzle, a deliverychamber, a steam control valve having portions controlling the steamsupply to both the lifting and the forcing steam nozzles, a water inlet,au-

tomatic overflow valves upon each of said overflow compartments, a levercontrolling one overflow valve and loaded by the pressure in saiddelivery chamber, a positively operated overflow valve on thecompartment having the lever loaded valve thereon, a lever operating thesteam valve, a cam operating when both the steam valve portions arefully open, as set forth.

3. In injectors, in combination, lifting and forcing steam inletnozzles, a combining nozzle, a delivery nozzle, a compartmentallydivided overflow chamber, a water inlet, automatic overflow valves uponsaid overflow compartments, a delivery chamber, a lever controlling oneoverflow valve and loaded by the pressure in said delivery chamber, anextension piece attached to said lever and controlling the otheroverflow valve, a locking member for said extension piece, a water inletto the overflow compartment adjacent the inlet end of the combiningnozzle, means for positively cutting off said water inlet, a steamcontrol valve having portions controlling the steam supply to both thelifting and the forcing steam nozzles, a positively operated overflowvalve on the overflow compartment adjacent the delivery end of thecombining nozzle, a lever operating the steam valve, a cam operating thepositive overflow valve, and a connecting rod providing anoperativeconnection between said steam valve lever and cam, as set forth.

In testimony whereof we have signed our names to this specification.

JAMES METCALFE. JAMES CROXON METOALFE. RICHARD DAVID METCALFEJ

